(19)

(11)

EP 3 033 644 A1

(12)

(43) Date of publication: 22.06.2016 Bulletin 2016/25 (21) Application number: 14765878.5 (22) Date of filing: 15.08.2014

(51) International Patent Classification (IPC):  G02B 17/08(2006.01) G02B 27/22(2006.01) G02B 21/22(2006.01) G02B 27/02(2006.01) (86) International application number: PCT/EP2014/067501 (87) International publication number: WO 2015/022427 (19.02.2015 Gazette 2015/07)

(84) Designated Contracting States: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR Designated Extension States: BA ME (30) Priority: 15.08.2013 GB 201314686 (71) Applicant: Vision Engineering Limited Woking, Surrey GU23 7ER (GB)	(72) Inventor: MERCER, Graham Peter Francis Hartley Witney Hampshire RG27 8NE (GB) (74) Representative: Boden, Keith McMurray  Fry Heath & Spence LLP The Gables 17 Massetts Road Horley Surrey RH6 7DQ Horley Surrey RH6 7DQ (GB)